ASRT Test Questions (Modules 1-12 ) Exam With Complete Solutions | Latest Update 2026/2027 | Graded A+ | 100% Assured Pass.

ASRT Test Questions (Modules 1-12 ) Exam With Complete Solutions | Latest Update 2026/2027 | Graded A+ | 100% Assured Pass. The most common type of magnet used in today's MR systems is the _______________. A. resistive magnet B. permanent magnet C. superconducting magnet D. open MR scanner - Answer C. superconducting magnet The positively charged part of an atom is the _____________. A. electron B. neutron C. proton D. nucleus - Answer C. proton When a hydrogen nucleus is positively charged and spins, it generates a small magnetic field called a _____________. A. larmor equation B. decay moment C. proton moment D. magnetic moment - Answer D. magnetic moment When placed in an external magnetic field, low-energy hydrogen nuclei (protons) point in the ____________ direction. A. parallel B. perpendicular C. antiparallel D. random - Answer A. parallel What term describes hydrogen protons, nuclei rotating in unison? A. out-of-phase precession B. in-phase precession C. magnetic moment D. nucleus of atoms - Answer B. in-phase precession Superconductive MR scanners that use cryogen gases have what kind of fields? A. vertical B. longitudinal C. horizontal D. transverse - Answer C. horizontal Which coil is located closes to the patient? A. magnet B. gradient C. shim D. radiofrequency - Answer D. radiofrequency When exposed to the magnetic field, a ___________ substance demonstrates a negative magnetic susceptibility, which means it is repelled by the magnetic field. A. ferromagnetic B. paramagnetic C. superparamagnetic D. diamagnetic - Answer D. diamagnetic Which of the following is a disadvantage of superconducting magnets? A. high operational costs B. low field strength C. expensive to purchase D. vertical magnetic field - Answer C. expensive to purchase The magnet must be shimmed before imaging sequences to: A. match the precessional frequency of hydrogen B. increase the strength of the radiofrequency pulse C. create a uniform magnetic field D. decrease the fringe field - Answer C. create a uniform magnetic field This process of applying RF energy to the patient in order to receive a signal from the protons in the body part being imaged is known as ______________. A. alignment B. resonance C. precession D. gyromagnetic ratio - Answer B. resonance Which of the following is used to describe the relationship between the static magnetic field and the precessional frequency of the hydrogen protons? A. concept of precessing B. larmor equation C. theory of magnetism D. MR equation - Answer B. larmor equation The location of an electron excited by magnetic fields and radiofrequency pulses can be determined using ____________ and an x, y, z, coordinate system. A. x-rays B. waveforms C. gradients D. microwaves - Answer C. gradients Which of the following factors can change the strength of an electromagnet? 1. the number of loops in the electromagnetic coil. 2. the current passing through the loops. 3. the spacing of the loops. A. 1 and 2 B. 1 and 3 C. 2 and 3 D. 1, 2, and 3 - Answer D. 1, 2 and 3 The _____________ coil is used to create homogeneity within the magnetic field. A. electromagnet B. RF C. z gradient D. shim - Answer D. shim Which of the following is a characteristic of ultra-high field magnets? A. signal-to-noise ratios are high and faster imaging times are possible. B. the scanner has an open design and large gantry aperture C. magnetic fringe fields are relatively small D. scanners are light and portable - Answer A. signal to noise ratios are high and faster imaging times are possible The ____________ gradient locates the signal along the short axis of the anatomy. A. slice-select B. x-gradient C. frequency-encoding D. phase-encoding - Answer D. phase-encoding